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a world of materials many products each with its own reality - - PowerPoint PPT Presentation
a world of materials many products each with its own reality - - PowerPoint PPT Presentation
a world of materials many products each with its own reality material data compressive stress relaxation tensile viscosity fatigue conductivity expansion properties that describe reality web services for material data Paperless MDM
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properties that describe reality
tensile compressive conductivity fatigue expansion stress relaxation
material data
viscosity
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web services for material data
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Paperless MDM Improves Quality and Availability of Material Data
Hubert Lobo
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Why all this?
Except for simple cases…. Material properties are not definitive! Handbook values are typical, not representative You cannot possibly measure all the possible nuances of a materials behavior- nor would you be interested
Problem
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Material properties differ…
Properties depend on the application
– on test conditions:
- temperature
- rate
- time
- environmental exposure
– the samples – the test specimens
Problem
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What’s good for selection…
The correct material property for a particular use may not be the right one for another application Conversely, it is pointless developing properties outside the context of an application
can be bad for VPD!
Problem
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Case 1
Automotive- Fuel Tank
– Material : Polyethylene (PE) – Deformation: large, low temp failure – Model: *ELASTIC/*PLASTIC – Data needed: stress-strain curve:
- fuel soaked specimens
- –40C
– Typical data: taken on virgin resin at 23C
Reality:
– Data at –40C is needed – Much stiffer, brittle failure? Example
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Finding the right data
Imagine wading through enormous swamps looking for the right data
– Handbooks – Internet – Databases – File cabinets – Colleagues and co-workers
Problem
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Inconsistent use of data
Handbook 1 Database Internal lab data Modulus for Material A Data Sources Engineer B Engineer A Engineer C XYZ Company
Problem
the six sigma killer…
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Poor properties can be fatal
Property no longer represents the behavior being simulated Can be a root cause of error in CAE Presents a serious credibility problem for analyst, CAE tool, and VPD
Problem
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How to avoid this?
Understand the environment that is being simulated Translate the behaviors into a set of measurable property requirements Pay heed to the underlying assumptions Develop representative properties Use consistently across VPD platform
Requirement
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The big picture
We need to store a multitude of varied properties Which depend on the end use application For diverse applications For diverse material types Useable in a variety of CAE solutions
a major mess…
Problem
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Introducing Matereality
Solution
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Handles data diversity
Solution
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Stores pertinent data
Solution
Material names are trademark of The Dow Chemical Company
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*
Records traceability
Solution
Material names are trademark of The Dow Chemical Company
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Displays variability
Solution
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Application to VPD and beyond
Product: safety glasses Material: polycarbonate Part designer’s matereality
- Stress-strain data
- Impact data
- Refractive index
Molder’s matereality
- Melt flow rate
- Izod strength
Moldflow analyst’s matereality
- Viscosity
- Thermal conductivity
- Melt density
- Specific heat
- No-flow temperature
Example
Moldflow is a trademark of Moldflow Corp.
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Stakeholders in VPD
material supplier end user CAE vendor Collaborate
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Matereality is collaborative,
co-workers contractors suppliers me Collaborate
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flexible,
Highly efficient data pipelines
my data source my competition my supplier me my data source Collaborate
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secure!
knowledge
Collaborate
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creates secure, flexible networks
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Matereality applied consistently
MDM Material A External Lab Material Supplier Internal lab Data Sources Engineer B Engineer A XYZ Company Engineer C XYZ Company’s collaborators
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Cost savings
Only the properties needed are measured Once measured, properties are shared by all stakeholders Reduced risk- no searching in dubious places for data
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Conclusions
Authoritative source of material data Stores entire context of data (paperless) Handles any kind of material data Selectively shareable by stakeholders Achieves cost benefits Reduces risk Extensible to entire product life cycle
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